Abstract
The effect of AgNO3 on the vase life and bud opening of cut flowers of Dendrobium ‘Pompadour’ was investigated. AgNO3 must be present continuously together with 8-hydroxyquinoline sulfate (HQS) and glucose in order to maximize water uptake and vase life. AgNO3 was more effective than silver thiosulfate (STS) in controlling microbial growth and in maximizing bud opening and vase life. Bacillus sp. was found in vase water from all treatments except that containing AgNO3, HQS and glucose. Foliar application of AgNO3 to the whole inflorescence did not increase vase life. Rates of ethylene production of the halved inflorescence bearing only flower buds or only open florets had no apparent relationship with vase life. This suggests that AgNO3 in the holding solution may act as an antimicrobial agent, and not as an inhibitor of ethylene synthesis.
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